GMC 12623095 Sensor Assembly, Knock

The knock sensors are mounted in two, 1 is left side of block and knock sensor 2 is on the right side above the starter motor. It is however difficult to access the knock sensors since they are located beneath the exhaust manifolds. First of all, lift the front of the car and secure it on jackstands to prevent slipping during the work. For all other models except 6.0L and 4WD, it may be required to drop the front driveshaft to get at knock sensor 1. In 6.0L models, to replace knock sensor 2, one has to remove the starter. For models other than 6.0 L, location and fastenings-knock sensor heat shield bolt and, depending on the car model, the heat shield should be removed. Remove the electrical connector with the left-side knock sensor that is located on the engine block to the front of the oil filler housing. Secondly, you should pull out the knock sensor retaining bolt then take out the knock sensor. Installation is done in reverse order of removal, where it is made certain that the knock sensor retaining bolt is tightened to the recommended torque.

The knock sensors are located on the back side of the engine block. Begin by raising the front of the vehicle and securely supporting it on jackstands. For 2015 and earlier 2.0L and 2.5L engines, remove the secondary air injection pump. For 2016 and later 2.0L models, access the rear sensor by removing the starter. Locate and disconnect the electrical connector from the knock sensor, then remove the retaining bolt and take out the sensor. Installation is the reverse of removal, ensuring to tighten the retaining bolt to the specified torque.

Disconnect the electrical connector, remove the bolt, and take out the knock sensor.

The knock sensor is located on the rear part of the engine block, to the left of the distributor.

You should remove the heat shield from the engine block.